Definition & Meaning of "fatso"in English

What is the origin of the term "fatso" and how is it used?

"Fatso" is English slang that appeared in the early 20th century, formed by adding the augmentative suffix "-so" to "fat" to emphasize size. It came to describe an overweight or obese person in a blunt and mocking way. The term is used in informal speech, insults, or teasing. It is derogatory, offensive, and body-shaming.